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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2163cc43a1ecc2cda7fd7e62b5c271fe68ab6fe278bce29f5bc5e24b3c2e7bc1' 
  AND token = 'cLLJ+qqhHyPiOwtMp37R1olD6t8m2cvHPfRz6efb1To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}